Hi @StalinPonnusamy,
In general, based on one of the sessions, Powerapps for GCC can be implemented and activated. As Microsoft has a strong tie-up with the US government. You have to verify your eligibility to activate this and make sure you are fully agreeing with compliance and data security.
Details of Microsoft and Government for your kind reference.
https://www.microsoft.com/en-us/industry/government
Hope it helps.
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